Use a comma before ‘although’ if it connects two independent clauses (unless they are closely connected and short). (COMMA_COMPOUND_SENTENCE_2[3]) Suggestions: `, although` URL: https://languagetool.org/insights/post/types-of-sentences/#compound-sentence Rule: https://community.languagetool.org/rule/show/COMMA_COMPOUND_SENTENCE_2?lang=en-US&subId=3 Category: PUNCTUATION